/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jclouds.osgi;

import org.jclouds.apis.ApiMetadata;

/**
 * A listener interface for {@link org.jclouds.apis.ApiMetadata}. In OSGi a api can be added or removed dynamically.
 * OSGi services using this interface will receive a notification whenever this happens.
 */
public interface ApiListener {

   /**
    * Method to be called when an api gets added.
    * 
    * @param api
    *           The api that was added.
    * @param <A>
    *           The {@link org.jclouds.apis.ApiMetadata}.
    */
   <A extends ApiMetadata> void added(A api);

   /**
    * Method to be called when an api gets removed.
    * 
    * @param api
    *           The api that was added.
    * @param <A>
    *           The {@link ApiMetadata}.
    */
   <A extends ApiMetadata> void removed(A api);
}
